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1. The graph shows the rate of uptake of magnesium ions by two similar plants, X and Y.
The roots of each plant were placed in a range of solutions. Each solution contained a
di erent concentration of magnesium ions. All other conditions were kept constant.
What is a possible explanation for the di erence in the results for the two plants?
A Plant Y has fewer protein carriers for magnesium ions in its cell membranes.
B Plant Y has a higher rate of respiration.
C Plant Y has more root hair cells.
D The root hair cells in plant Y have a lower water potential.
2. Which substance is used to test a food for vitamin C?
A Benedict’s solution
B DCPIP
C ethanol
D iodine solution
3. In DNA, what is the correct base pairing?
A T with C B T with T C T with G D T with A
4. What remains at the end of an enzyme-controlled reaction?
A enzymes and products
B enzymes and substrates
C enzymes only
D products only
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5. A plant is placed in the dark until all its stored starch is used up. The plant is placed in
light with black paper over part of one green leaf.
After eight hours, the leaf is tested for starch.
Which diagram shows the appearance of the leaf after this test?
6. Certain factors are needed for photosynthesis.
If a factor is in short supply, it limits the rate of photosynthesis.
Which of these could be limiting factors?
1 carbon dioxide
2 oxygen
3 light intensity
A 1 and 2 B 1 and 3 C 2 and 3 D 3 only
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7. The diagram shows part of a cross-section of a leaf.
Which row shows the correct labels?
8. Why do plants need nitrate ions?
A Nitrogen is a component of amino acids.
B Nitrogen is a component of fatty acids.
C Nitrogen is a component of glucose.
D Nitrogen is a component of starch
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9.The graph shows the e ect of temperature on the rate of photosynthesis.
Which statement explains the change in rate of photosynthesis between 15 °C and 20°C?
A Chlorophyll is able to transfer more energy in chemicals to energy in light.
B Enzymes involved in photosynthesis have denatured.
C Kinetic energy of molecules is increasing, resulting in more e ective collisions.
D Light intensity and not temperature is limiting the rate of photosynthesis.
10. The graph shows the results of an investigation into the e ect of oxygen on the
uptake of glucose by cells.
Which conclusion can be made about these data?
A Glucose only enters the cells by active transport.
B Glucose only enters the cells by di usion.
C Glucose enters the cells by both active transport and di usion.
D Glucose enters the cells by osmosis.
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11. The graph shows the rate of photosynthesis with increasing light intensity.
Where is light intensity a limiting factor for photosynthesis?
A between 1 and 2
B between 1 and 3
C between 2 and 4
D between 3 and 4
12. The data show the concentrations of sugar and starch in an onion.
The onion is tested with Benedict’s solution and iodine solution.
Which set of results is correct?
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13. The diagram shows a mitochondrion. The scale bar shows the actual size of the
mitochondrion.
The diagram is 70 mm long.
What is the magni cation of the diagram?
14. Two types of cell, one animal and one plant, were examined using a light microscope.
Which row shows the correct combination of structures that would be observed in the
cells?
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15. In which molecule are cross-links formed between bases?
A carbohydrate
B DNA
C fat
D glycogen
16. What are the smaller basic units of starch and glycogen molecules?
17. How do the air spaces in the spongy mesophyll of a leaf help to adapt it for
photosynthesis?
A They act as a store of oxygen.
B They allow carbon dioxide gas to di use through the leaf more rapidly.
C They increase the surface area for absorption of light energy.
D They let rainwater enter the leaf tissues.
18. A chromosome was analyzed and found to have 6125 pairs of bases. The type of
each base was identi ed and 2345 of the bases were G.
How many of the bases in this chromosome are T?
A 1435
B 3780
C 6125
D 7560
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19. Tomato fruit production was measured in ve di erent environmental conditions.
What is a correct conclusion for the data shown in the graph?
A There are no limiting factors in 1, so tomato fruit production is the lowest.
B Temperature is the limiting factor in 3.
C Carbon dioxide is the limiting factor in all ve environmental conditions.
D Light is the limiting factor in 4.
20. Which type of molecule are enzymes made of?
A carbohydrates
B fats
C proteins
D vitamins
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21. All living organisms release energy from nutrient molecules within their cells.
What is the name of this characteristic?
A growth
B nutrition
C respiration
D sensitivity
22. DNA is made up of ......1...... strands coiled together. The strands contain chemicals
called
......2...... . These chemicals form ......3...... , A pairing with T and C pairing with G.
Which words correctly complete gaps 1, 2 and 3?
23. Which diagram represents the action of lipase?
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24. Plant tissue is placed in a solution.
What would cause plasmolysis of the plant cells?
1 the external solution having a higher water potential than the plant cells
2 the external solution having a lower water potential than the plant cells
3 water moving out of the plant cells
4 water moving into the plant cells
A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4
25. The graph shows the concentration of a substance during the course of an enzyme-
controlled reaction.
Which substance is this?
A enzyme
B enzyme-substrate complex
C product
D substrate
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